<template>
  <div class="login">
    <van-nav-bar title="会员登录" left-arrow @click-left="$router.go(-1)" />

    <div class="container">
      <div class="title">
        <h3>手机号登录</h3>
        <p>未注册的手机号登录后将自动注册</p>
      </div>

      <div class="form">
        <div class="form-item">
          <input v-model="mobile" class="inp" maxlength="11" placeholder="请输入手机号码" type="text">
        </div>
        <div class="form-item">
          <input v-model="picCode" class="inp" maxlength="5" placeholder="请输入图形验证码" type="text">
          <img v-if="picUrl" :src="picUrl" @click="onImgCaptchaClick" alt="">
        </div>
        <div class="form-item">
          <input v-model="smsCode" class="inp" placeholder="请输入短信验证码" type="text">
          <button @click="onGetSMSCodeBtnClick">
            {{ second === totalSecond ? '获取验证码' : second + '秒后重新发送'}}
          </button>
        </div>
      </div>

      <div @click="login" class="login-btn">登录</div>
    </div>
  </div>
</template>

<script>
import { Toast } from 'vant'

import {
  GetImgCaptchaDataFromSrv, GetSmsCodeDataFromSrv
  , LoginToSrv
} from '@/utils/request'

export default {
  name: 'LoginView',
  data () {
    return {
      picKey: '', // 将来请求传递的图形验证码唯一标识
      picUrl: '', // 存储请求渲染的图片地址
      totalSecond: 60, // 总秒数
      second: 60, // 当前秒数，开定时器对 second--
      timer: null, // 定时器 id
      mobile: '13012345678', // 手机号
      picCode: '', // 用户输入的图形验证码
      smsCode: '' // 短信验证码
    }
  },
  async created () {
    this.updateImgCaptchaDataFromSrv()
  },
  methods: {
    async updateImgCaptchaDataFromSrv () {
      const res = await GetImgCaptchaDataFromSrv()
      // console.log(res)
      this.picUrl = res.data.base64
      this.picKey = res.data.key
    },
    // 校验 手机号 和 图形验证码 是否合法
    // 通过校验，返回true
    // 不通过校验，返回false
    validFn () {
      if (!/^1[3-9]\d{9}$/.test(this.mobile)) {
        this.$toast('请输入正确的手机号')
        return false
      }
      if (!/^\w{4}$/.test(this.picCode)) {
        this.$toast('请输入正确的图形验证码')
        return false
      }
      return true
    },
    async login () {
      if (!this.validFn()) {
        return
      }

      if (!/^\d{6}$/.test(this.smsCode)) {
        Toast.fail('请输入正确的验证码')
        return
      }

      const res = await LoginToSrv(this.mobile, this.smsCode)
      // 保存到vuex
      this.$store.commit('user/setUserInfo', {
        token: res.data.token,
        userId: res.data.userId
      })

      Toast.success('登录成功')

      const needBack = this.$route.query.needBack
      if (needBack) {
        this.$router.go(-1)
        return
      }

      this.$router.push('/')
    },

    // ***** 以下写槽函数 *****

    async onImgCaptchaClick () {
      this.updateImgCaptchaDataFromSrv()
    },
    async onGetSMSCodeBtnClick () {
      if (!this.validFn()) {
        return
      }

      if (this.timer || this.second !== this.totalSecond) {
        return
      }

      const res = await GetSmsCodeDataFromSrv(this.picCode, this.picKey, this.mobile)
      console.log('onGetSMSCodeBtnClick', res)
      Toast.success('短信发送成功，注意查收')

      this.timer = setInterval(() => {
        this.second -= 1

        if (this.second <= 0) {
          clearInterval(this.timer)
          this.timer = null
          this.second = this.totalSecond
        }
      }, 1000)
    }
  },
  destroyed () {
    clearInterval(this.timer)
    this.timer = null
  }
}
</script>

<style lang="less" scoped>
.container {
  padding: 49px 29px;

  .title {
    margin-bottom: 20px;
    h3 {
      font-size: 26px;
      font-weight: normal;
    }
    p {
      line-height: 40px;
      font-size: 14px;
      color: #b8b8b8;
    }
  }

  .form-item {
    border-bottom: 1px solid #f3f1f2;
    padding: 8px;
    margin-bottom: 14px;
    display: flex;
    align-items: center;
    .inp {
      display: block;
      border: none;
      outline: none;
      height: 32px;
      font-size: 14px;
      flex: 1;
    }
    img {
      width: 94px;
      height: 31px;
    }
    button {
      height: 31px;
      border: none;
      font-size: 13px;
      color: #cea26a;
      background-color: transparent;
      padding-right: 9px;
    }
  }

  .login-btn {
    width: 100%;
    height: 42px;
    margin-top: 39px;
    background: linear-gradient(90deg,#ecb53c,#ff9211);
    color: #fff;
    border-radius: 39px;
    box-shadow: 0 10px 20px 0 rgba(0,0,0,.1);
    letter-spacing: 2px;
    display: flex;
    justify-content: center;
    align-items: center;
  }
}
</style>
